M- Tech!20 \5IES/MCC/\/2
NATIONAL INSTITUTE OF TECHNOLOGY
(Established by Ministry of Human Resource Development, Govt. of India)
Yupia, District Papum Pare, Arunachal Pradesh -791112
fax: 03611- 2284972. E-mail: nitarunachnle
g",ail.com
End Semester Examination (July - December) 2015
Mobile Computing (CSE-902)
Max. Marks: 100
Time: 3 Hours
Instructions:
I. Attempt as many questions as you can from each unit separately.
2. The question consists of 4 units of35 marks each, out of which the maximum marks will be limited
to 25 marks only.
3. Symbols have their usual meanings.
UNIT -I
1. Give an example of five mobile Computing applications? What are the characteristic
of a Mobile Computing environment?
(5+5)
2. What are the essential functional differences between I" Generation, 2nd Generation,
and 3rd Generation of networks?
(5 + 5 +5)
3. Answer the followings:
(2x5)
a) What is a "Aperiodic" signal?
b) What is Mobility?
c) What is a bandwidth?
d) Define attenuation.
e) What are the shapes related to a cell?
UNIT -II
1. Answer the followings:
a) What are the types of handoff?
b) Who is the pioneer of wireless telegraphy?
c) What is the principle used in multiplexers?
d) State the need for Medium Access Control in network communication.
e) Specify the advantages and drawbacks of infrared technology?
(2 x5)
2. Compare the features of SDMA, FDMA, and CDMA with their advantages and
disadvantages.
(10)
3. What are hidden and exposed terminals? Explain in detail the different TDMA
mechanisms with appropriate figures.
(15)
UNIT -III
1. Write short notes(any three)
a) Slow fading
(5+5+5)
b) Coherent bandwidth
c) Path loss
d) Doppler effect
2. Explain the mobile wave propagation mechanism in free space?
(10)
3. Find the median path loss using Okumura's model for d=50 km, h., = 100m, hr.
=IOm in a suburban environment. If the base station transmitter radiates an
EIRP(effective isotropic radiated power) of 1 kW at a carrier frequency of900MHz,
find the power at the receiver(assume a unity gain receiving antenna)
(10)
UNIT-IV
1. a) With an example explain the direct sequence spread spectrum.
b) Explain the terms and their functionalities ofGSM architecture.
2. a) Discuss in detail about Location Management in mobile networks.
b) State the events happened between the BS and MS during Handover.
c) Write a short note on SMS.
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(5+10)
(5+5+5)